2. Combine tomatoes, red onion, cilantro, jalapeno pepper, lemon juice, and 1 tablespoon olive oil in a bowl. Place squash halves on a baking sheet. Fill butternut squash cavities with tomato salsa mixture, reserving about 2 tablespoons of salsa for garnish. Brush cut surfaces of squash with 1 tablespoon olive oil. Sprinkle squash with 2 tablespoons of dill.